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<html>
	<head>
		<meta charset="UTF-8">
		<title>类选择器</title>
		<style>
			.div2 {
				font-size: 30px;
				color: pink;
			}
		</style>
	</head>
	<body>
		<div>
			类选择器11
		</div>
		<div class="div2">
			类选择器22
		</div>
		<div>
			类选择器33
		</div>
		<div class="div2">
			类选择器44
		</div>
		<div>
			类选择器55
		</div>
		<div>
			类选择器66
		</div>
	</body>
</html>
